46295 + Interview Questions in Chemistry Page 25 InterviewSolution

1201.	How do solar panels work?
Answer» How do solar panels work?

Discussion

1202.	In hydrogen atom the debroglie wavelength of an election in the second Bohr orbit is And (given Bohr radius is r0 i.e raddi not =52.9pm)
Answer» In hydrogen atom the debroglie wavelength of an election in the second Bohr orbit is And (given Bohr radius is r0 i.e raddi not =52.9pm)

Discussion

1203.	Concentration of a reaction A is changed from 0.044 M to 0.032 M in 25 minutes .the average rate of reaction during this time interval is
Answer» Concentration of a reaction A is changed from 0.044 M to 0.032 M in 25 minutes .the average rate of reaction during this time interval is

Discussion

1204.	Liquid benzene burns in oxygen according to 2C6H6 + 15O2 - 12 CO2 +6H2O How many litres of O2 at STP are needed to complete the combustion of 39g of liquid benzene?
Answer» Liquid benzene burns in oxygen according to 2C6H6 + 15O2 - 12 CO2 +6H2O How many litres of O2 at STP are needed to complete the combustion of 39g of liquid benzene?

Discussion

1205.	Reference point
Answer» Reference point

Discussion

1206.	In an alloy of copper, silver and gold, the copper atoms constitute the ccp lattice and silver atoms occupies half of the tetrahedral voids and gold is present at the octahedral voids of the unit cell. What will be the formula of the compound if all the atoms from one of the faces of the cube are removed?
Answer» In an alloy of copper, silver and gold, the copper atoms constitute the ccp lattice and silver atoms occupies half of the tetrahedral voids and gold is present at the octahedral voids of the unit cell. What will be the formula of the compound if all the atoms from one of the faces of the cube are removed?

Discussion

1207.	The frequency of yellow light having wavelength 600 nm is
Answer» The frequency of yellow light having wavelength 600 nm is

Discussion

1208.	Grignard reagent does nt react with carboxylic acid
Answer» Grignard reagent does nt react with carboxylic acid

Discussion

1209.	K2MnO4 in acidic or neutral medium undergo disproportionation reaction to give
Answer» $K_{2} M n O_{4}$ in acidic or neutral medium undergo disproportionation reaction to give

Discussion

1210.	The molar conductivity of aqueous solution of a weak acid, HA is 200 S cm2mol−1 and its pH is 4. What is the value of pKa of HA at 25∘C?(Given:λ0m(NaA)=100 S cm2mol−1, λ0m(HCl)=425 S cm2mol−1, λ0m(NaCl)=125 S cm2mol−1)
Answer» The molar conductivity of aqueous solution of a weak acid, $H A$ is $200 {S cm}^{2} {mol}^{- 1}$ and its $pH$ is $4$ . What is the value of ${pK}_{a}$ of $H A$ at $25^{\circ} C$ ? (Given: $λ_{m}^{0} (N a A) = 100 {S cm}^{2} {mol}^{- 1}, λ_{m}^{0} (H C l) = 425 {S cm}^{2} {mol}^{- 1}, λ_{m}^{0} (N a C l) = 125 {S cm}^{2} {mol}^{- 1}$ )

Discussion

1211.	The non-stoichiometric compound Fe0.94O is formed when x% of Fe2+ ions are replaced by as many 23Fe3+ ions, x is ?
Answer» The non-stoichiometric compound $F e_{0.94} O$ is formed when x% of $F e^{2 +}$ ions are replaced by as many $\frac{2}{3} F e^{3 +}$ ions, x is ?

Discussion

1212.	Cooper can be extractted by hydrometallurgy but not zinc Explain.
Answer» Cooper can be extractted by hydrometallurgy but not zinc Explain.

Discussion

1213.	A cylindrical bar magnet is kept along the axis of a circular coil.magnet is rotated about its axis,
Answer» A cylindrical bar magnet is kept along the axis of a circular coil.magnet is rotated about its axis,

Discussion

1214.	In the detection of carbon, CO2 formed after reaction with CuO is tested by:
Answer» In the detection of carbon, $C O_{2}$ formed after reaction with $C u O$ is tested by:

Discussion

1215.	In which reactions, product formation takes place according to Hofmann's rule?
Answer» In which reactions, product formation takes place according to Hofmann's rule?

Discussion

1216.	The molal elevation constant of water is 0.51∘CKgmol−1 . The boiling point of 0.1 molal aqueous NaCl solution is nearly :
Answer» The molal elevation constant of water is ${0.51}^{\circ} C$ $K g m o l^{- 1}$ . The boiling point of 0.1 molal aqueous NaCl solution is nearly :

Discussion

1217.	A forms FCC system keeping B at all edge centers and body center .If all the atoms present on one body diagonal plane are removed , molecular formula of the final crystal will be -A )AB B)A2B C)AB2 D)A2B3
Answer» A forms FCC system keeping B at all edge centers and body center .If all the atoms present on one body diagonal plane are removed , molecular formula of the final crystal will be - A )AB B)A2B C)AB2 D)A2B3

Discussion

1218.	why is an atom elecrically neutral
Answer» why is an atom elecrically neutral

Discussion

1219.	A gas in equilibrium has uniform density and pressure throughout its volume. This is strictly true only if there are no external influences. A gas column under gravity, for example, does not have uniform density (and pressure). As you might expect, its density decreases with height. The precise dependence is given by the so-called law of atmospheres n₂ = n₁ exp [ -mg (h₂ – h₁ )/ kBT] where n2, n1 refer to number density at heights h2 and h1 respectively. Use this relation to derive the equation for sedimentation equilibrium of a suspension in a liquid column: n₂ = n₁ exp [ -mg NA (r - r¢ ) (h₂ –h₁ )/ (r RT)] where r is the density of the suspended particle, and r¢ , that of surrounding medium. [NA is Avogadro’s number, and R the universal gas constant.] [Hint : Use Archimedes principle to find the apparent weight of the suspended particle.]
Answer» A gas in equilibrium has uniform density and pressure throughout its volume. This is strictly true only if there are no external influences. A gas column under gravity, for example, does not have uniform density (and pressure). As you might expect, its density decreases with height. The precise dependence is given by the so-called law of atmospheres n₂ = n₁ exp [ -mg (h₂ – h₁ )/ kBT] where n2, n1 refer to number density at heights h2 and h1 respectively. Use this relation to derive the equation for sedimentation equilibrium of a suspension in a liquid column: n₂ = n₁ exp [ -mg NA (r - r¢ ) (h₂ –h₁ )/ (r RT)] where r is the density of the suspended particle, and r¢ , that of surrounding medium. [NA is Avogadro’s number, and R the universal gas constant.] [Hint : Use Archimedes principle to find the apparent weight of the suspended particle.]

Discussion

1220.	Prove that pressure is a state variable
Answer» Prove that pressure is a state variable

Discussion

1221.	When SO2 is passed in acidified potassium dichromate solution ,the oxidation number of S is changed from 1)+4 to zero .2)+4to +2 .3)+4 to +6 .4)+6to +
Answer» When SO2 is passed in acidified potassium dichromate solution ,the oxidation number of S is changed from 1)+4 to zero .2)+4to +2 .3)+4 to +6 .4)+6to +

Discussion

1222.	What is the meaning of blunt/flush/sticky ends?
Answer» What is the meaning of blunt/flush/sticky ends?

Discussion

1223.	The element having greatest difference between its first and second ionisation energy is:
Answer» The element having greatest difference between its first and second ionisation energy is:

Discussion

1224.	What is orbital overlap concept?
Answer» What is orbital overlap concept?

Discussion

1225.	3. Predict the alkenes that would be formed by dehydrohalogenation with sodium ethoxide and ethanol. Predict major alkenes:(a) 2-chloro-2-methylbutane(b) 3-bromo-2, 2, 3-trimethylpentane
Answer» 3. Predict the alkenes that would be formed by dehydrohalogenation with sodium ethoxide and ethanol. Predict major alkenes: (a) 2-chloro-2-methylbutane (b) 3-bromo-2, 2, 3-trimethylpentane

Discussion

1226.	The successive ionization energies for element X is given belowIE1=250 kj mol^-1IE2=820 kj mol^-1IE3=1100 kj mol^-1IE4=1400 kj mol^-1Find out the number of valence electrons for the element Xoptions 1 32 43 24 1
Answer» The successive ionization energies for element X is given below IE1=250 kj mol^-1 IE2=820 kj mol^-1 IE3=1100 kj mol^-1 IE4=1400 kj mol^-1 Find out the number of valence electrons for the element X options 1 3 2 4 3 2 4 1

Discussion

1227.	An aqueous solution of 0.667 M nitric acid has density 1.2 g cm. Calculate) Molality.Mass percentage of solute.(iii Mole fraction of solvent.
Answer» An aqueous solution of 0.667 M nitric acid has density 1.2 g cm. Calculate) Molality.Mass percentage of solute.(iii Mole fraction of solvent.

Discussion

1228.	Photoelectric effect and electromagnetic spectrum in brief with suitable example
Answer» Photoelectric effect and electromagnetic spectrum in brief with suitable example

Discussion

1229.	10. order of reactivity of different aryl halides through nucleophilic aromatic substitution mechanism
Answer» 10. order of reactivity of different aryl halides through nucleophilic aromatic substitution mechanism

Discussion

1230.	gram eqiuivalent volume of O2 at st
Answer» gram eqiuivalent volume of O2 at st

Discussion

1231.	Benzene carboxylic acid do not give reaction with nacn ,why?
Answer» Benzene carboxylic acid do not give reaction with nacn ,why?

Discussion

1232.	The product of acid catalysed hydration of 2-phenylpropene is
Answer» The product of acid catalysed hydration of 2-phenylpropene is

Discussion

1233.	what is hydroboration oxidation reaction?
Answer» what is hydroboration oxidation reaction?

Discussion

1234.	The correct decreasing order of dipole moments for the given molecules is:(BF3,NF3 and NH3)
Answer» The correct decreasing order of dipole moments for the given molecules is: $(B F_{3}, N F_{3}$ and $N H_{3})$

Discussion

1235.	Two closed vessels of equal volume containing air at pressure p1 and temperature T1 are connected to temperature in one of the vessels is now maintained at T1 and that in the other at T2. What will be the pressure in the vessels?
Answer» Two closed vessels of equal volume containing air at pressure p₁ and temperature T₁ are connected to temperature in one of the vessels is now maintained at T₁ and that in the other at T₂. What will be the pressure in the vessels?

Discussion

1236.	an equation is given here (p+a/v2=btete/v where p= pressure v= volume if ab are constants the dimension of a are
Answer» an equation is given here (p+a/v2=btete/v where p= pressure v= volume if ab are constants the dimension of a are

Discussion

1237.	what is the relation between negative value of a standard electrode potential and a stable oxidised species . and explain
Answer» what is the relation between negative value of a standard electrode potential and a stable oxidised species . and explain

Discussion

1238.	You know that 1 F is charge of 1 mole of electrons. How many moles of a trivalent cation would 5 F reduce?
Answer» You know that 1 F is charge of 1 mole of electrons. How many moles of a trivalent cation would 5 F reduce?

Discussion

1239.	A vessel contains 1.6 g of dioxygen at STP (273.15 K, 1 atm pressure). The gas is now transferred to another vessel at constant temperature, where pressure becomes half of the original pressure. Calculate (i) Volume of the new vessel. (ii) Number of molecules of dioxygen ?
Answer» A vessel contains 1.6 g of dioxygen at STP (273.15 K, 1 atm pressure). The gas is now transferred to another vessel at constant temperature, where pressure becomes half of the original pressure. Calculate (i) Volume of the new vessel. (ii) Number of molecules of dioxygen ?

1239.

A vessel contains 1.6 g of dioxygen at STP (273.15 K, 1 atm pressure). The gas is now transferred to another vessel at constant temperature, where pressure becomes half of the original pressure. Calculate (i) Volume of the new vessel. (ii) Number of molecules of dioxygen ?

Answer»

A vessel contains 1.6 g of dioxygen at STP (273.15 K, 1 atm pressure). The gas is now transferred to another vessel at constant temperature, where pressure becomes half of the original pressure. Calculate

(i) Volume of the new vessel.

(ii) Number of molecules of dioxygen ?

Discussion

1240.	The basic character of hydroxides of alkaline earth metals increase in the order:
Answer» The basic character of hydroxides of alkaline earth metals increase in the order:

Discussion

1241.	the order of reactivity towards E2 elimination -1.Chlorocyclohexane2. 1- Chlorocyclohex-2-ene3. 1- Chloro1,methylcyclohexane4.
Answer» the order of reactivity towards E2 elimination - 1.Chlorocyclohexane 2. 1- Chlorocyclohex-2-ene 3. 1- Chloro1,methylcyclohexane 4.

Discussion

1242.	Ethylene glycol on heating with con. H2SO4 gives mainly:
Answer» Ethylene glycol on heating with con. $H_{2} S O_{4}$ gives mainly:

Discussion

1243.	Who was the first one to prepare HCl gas?
Answer» Who was the first one to prepare HCl gas?

Discussion

1244.	Balance the given equetion by ion electron method: NO_3^{- }+Cl^-+H^+=NO+Cl_{2 }+H_2O
Answer» Balance the given equetion by ion electron method: NO_3^{- }+Cl^-+H^+=NO+Cl_{2 }+H_2O

Discussion

1245.	What is n factor for Water?
Answer» What is n factor for Water?

Discussion

1246.	Give a brief description of tritium
Answer» Give a brief description of tritium

Discussion

1247.	4. how to identify hybridisation if central atom has lone pairs?
Answer» 4. how to identify hybridisation if central atom has lone pairs?

Discussion

1248.	92.At each of the four corners of a square of side A, a charge +q is placed freely. What charge should be placed at centre of square so that the whole system be in equilibrium?
Answer» 92.At each of the four corners of a square of side A, a charge +q is placed freely. What charge should be placed at centre of square so that the whole system be in equilibrium?

Discussion

1249.	number of electrons in 14 gram common salt
Answer» number of electrons in 14 gram common salt

Discussion

1250.	Which of the following compounds contains an amine group?
Answer» Which of the following compounds contains an amine group?

Discussion

Explore topic-wise InterviewSolutions in .

How do solar panels work?

In hydrogen atom the debroglie wavelength of an election in the second Bohr orbit is And (given Bohr radius is r0 i.e raddi not =52.9pm)

Concentration of a reaction A is changed from 0.044 M to 0.032 M in 25 minutes .the average rate of reaction during this time interval is

Liquid benzene burns in oxygen according to 2C6H6 + 15O2 - 12 CO2 +6H2O How many litres of O2 at STP are needed to complete the combustion of 39g of liquid benzene?

Reference point

The frequency of yellow light having wavelength 600 nm is

Grignard reagent does nt react with carboxylic acid

K2MnO4 in acidic or neutral medium undergo disproportionation reaction to give

The molar conductivity of aqueous solution of a weak acid, HA is 200 S cm2mol−1 and its pH is 4. What is the value of pKa of HA at 25∘C?(Given:λ0m(NaA)=100 S cm2mol−1, λ0m(HCl)=425 S cm2mol−1, λ0m(NaCl)=125 S cm2mol−1)

The non-stoichiometric compound Fe0.94O is formed when x% of Fe2+ ions are replaced by as many 23Fe3+ ions, x is ?

Cooper can be extractted by hydrometallurgy but not zinc Explain.

A cylindrical bar magnet is kept along the axis of a circular coil.magnet is rotated about its axis,

In the detection of carbon, CO2 formed after reaction with CuO is tested by:

In which reactions, product formation takes place according to Hofmann's rule?

The molal elevation constant of water is 0.51∘CKgmol−1 . The boiling point of 0.1 molal aqueous NaCl solution is nearly :

A forms FCC system keeping B at all edge centers and body center .If all the atoms present on one body diagonal plane are removed , molecular formula of the final crystal will be -A )AB B)A2B C)AB2 D)A2B3

why is an atom elecrically neutral

Prove that pressure is a state variable

When SO2 is passed in acidified potassium dichromate solution ,the oxidation number of S is changed from 1)+4 to zero .2)+4to +2 .3)+4 to +6 .4)+6to +

What is the meaning of blunt/flush/sticky ends?

The element having greatest difference between its first and second ionisation energy is:

What is orbital overlap concept?

3. Predict the alkenes that would be formed by dehydrohalogenation with sodium ethoxide and ethanol. Predict major alkenes:(a) 2-chloro-2-methylbutane(b) 3-bromo-2, 2, 3-trimethylpentane

The successive ionization energies for element X is given belowIE1=250 kj mol^-1IE2=820 kj mol^-1IE3=1100 kj mol^-1IE4=1400 kj mol^-1Find out the number of valence electrons for the element Xoptions 1 32 43 24 1

An aqueous solution of 0.667 M nitric acid has density 1.2 g cm. Calculate) Molality.Mass percentage of solute.(iii Mole fraction of solvent.

Photoelectric effect and electromagnetic spectrum in brief with suitable example

10. order of reactivity of different aryl halides through nucleophilic aromatic substitution mechanism

gram eqiuivalent volume of O2 at st

Benzene carboxylic acid do not give reaction with nacn ,why?

The product of acid catalysed hydration of 2-phenylpropene is

what is hydroboration oxidation reaction?

The correct decreasing order of dipole moments for the given molecules is:(BF3,NF3 and NH3)

Two closed vessels of equal volume containing air at pressure p1 and temperature T1 are connected to temperature in one of the vessels is now maintained at T1 and that in the other at T2. What will be the pressure in the vessels?

an equation is given here (p+a/v2=btete/v where p= pressure v= volume if ab are constants the dimension of a are

what is the relation between negative value of a standard electrode potential and a stable oxidised species . and explain

You know that 1 F is charge of 1 mole of electrons. How many moles of a trivalent cation would 5 F reduce?

A vessel contains 1.6 g of dioxygen at STP (273.15 K, 1 atm pressure). The gas is now transferred to another vessel at constant temperature, where pressure becomes half of the original pressure. Calculate (i) Volume of the new vessel. (ii) Number of molecules of dioxygen ?

The basic character of hydroxides of alkaline earth metals increase in the order:

the order of reactivity towards E2 elimination -1.Chlorocyclohexane2. 1- Chlorocyclohex-2-ene3. 1- Chloro1,methylcyclohexane4.

Ethylene glycol on heating with con. H2SO4 gives mainly:

Who was the first one to prepare HCl gas?

Balance the given equetion by ion electron method: NO_3^{- }+Cl^-+H^+=NO+Cl_{2 }+H_2O

What is n factor for Water?

Give a brief description of tritium

4. how to identify hybridisation if central atom has lone pairs?

92.At each of the four corners of a square of side A, a charge +q is placed freely. What charge should be placed at centre of square so that the whole system be in equilibrium?

number of electrons in 14 gram common salt

Which of the following compounds contains an amine group?